In a new book, The Anti-Intellectual Presidency, Elvin T. Lim subjects all the words ever publicly intoned by American presidents to a thorough statistical analysisand he finds, unsurprisingly, an alarmingly steady decline. A century ago, Lim writes, presidential speeches were pitched at a college reading level; today, they’re down to eighth grade...Since 1913, the length of the average presidential sentence has fallen from 35 words to 22. Between Nixon and the second Bush, the average presidential sound bite shrank from 42 seconds to 7. Today’s State of the Unions inspire roughly 30 seconds of applause for every 60 seconds of speech. Although it’s tempting to blame the sorry state of things on the current malapropist-in-chief, Bush is only the latest flower (though, obviously, a particularly striking one) on a very deep weed. Our most brilliant presidents, Lim says, often work hard to seem publicly dumb in order to avoid the stain of elitismamazingly, Bill Clinton’s total rhetorical output checks in at a lower reading level than Bush’s. Clinton’s former speechwriters told Lim that their image-conscious boss always demanded that his speeches be “more talky”; today, he’s widely remembered as a brilliant speaker who never gave a memorable speech.

Obama seems to have taken the opposite tack: He’s a Clinton-style natural who flaunts the artifice of his speeches and refuses to strategically hide his intelligence. Compared with his rivals, Obama’s skill-set seems almost otherworldly. His phrases line up regularly in striking and meaningful patterns; his cliché ratio is, for a politician, admirably low; his stresses and pauses seem dictated less by the usual metronome of generic political speech than by the actual structures of meaning behind his words. He tolerates complexity to such an extent that he’s sometimes criticized as “professorial,” which allows him to get away with inspirational catchphrases that would sound like platitudes coming from anyone else. His naïve-sounding calls for change are persuasive largely because he’s already managed to improve one of our most intractable political problems: the decades-old, increasingly virulent plague of terrible speechifying.